Iodine content of fish otoliths in species found in diverse habitats

Iodine content of fish otoliths in species found in diverse habitats
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不同栖息地的鱼类耳石的碘含量

DOI:
10.1007/s10641-022-01228-6
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发表时间:
2022
影响因子:
1.4
通讯作者:
Lu, Zunli
Lu, Zunli
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
He, Ruliang;Limburg, Karin E.;Walther, Benjamin D.;Samson, Melvin A.;Lu, Zunli

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在过去的几十年里,水生除氧的扩大改变了栖息地的质量和可获得性,并使许多鱼类的身体状况恶化。除确定锰/钙外,在鱼类耳石中确定互补的化学氧化还原代用品,将加强识别各种水生生境中低氧暴露的能力。钙钙比已被用于海洋沉积物和生物矿化材料中,用于重建过去的氧化还原条件。为了探索不同的内源和外源过程的影响,用LA-ICPMS对耳石岩心的I/Ca比值进行了大量的数据集,包括来自淡水、河口和沿海水域的10个分类目中的30种鱼类,并与其他化学替代物(Mn/Ca和Sr/Ca)进行了比较。我们的结果表明,不是单一的非生物因素,包括氧化还原条件和由锰/钙和锶/钙衍生的盐度,可以预测I/Ca值,尽管它们可能与特定鱼种相关。对于某些物种来说,碘可能与耳石核心中的有机质有关。母体迁移、栖息地变化、食物来源、系统发育和生态也可能影响I/Ca比率。基于这些探索性结果,我们提出了一系列未来的研究方向,以进一步评估控制耳石碘生物矿化的因素及其作为氧化还原代用品的用途。
Expansion of aquatic deoxygenation has altered the quality and availability of habitats and worsened body condition for many fish species through past decades. Identifying complementary chemical redox proxies in fish otoliths, in addition to Mn/Ca, would strengthen the ability to identify hypoxia exposure in a diversity of aquatic habitats. I/Ca ratios have been used in marine sediments and bio-mineralized materials for reconstruction of past redox conditions. In order to explore influences from various endogenous and exogenous processes, a large data set of I/Ca ratios from cores of otoliths, including fishes from fresh, estuarine, and coastal waters across 30 species within 10 taxonomic orders, were reported with other chemical proxies (Mn/Ca and Sr/Ca) using LA-ICP-MS. Our results suggest no single abiotic factor, including redox condition and salinity derived from Mn/Ca and Sr/Ca, predicts I/Ca values, while they may be correlated for specific fish species. Iodine may be related to organic matter in the cores of otoliths for some species. Maternal transfer, habitat change, dietary source, phylogeny, and ecology may also influence I/Ca ratios. Based on these exploratory results, we suggest a range of future research directions to further evaluate the factors controlling biomineralization of otolith iodine and its utility as a redox proxy.
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